. Fumigation for the citrus white fly, as adapted to Florida conditions . red scale{CJirysompliulus ficus Ashm.) (fig. 10) is destroyed with a thorough-ness near to absolute extermination by the same dosage which isrequired for the white fly. This has been conclusively proved by theexperimental work conducted by the writer and Mr. W. W. Yothersin January of the present year. Not infrequently in Florida the scaleinsect referred to causes sufficient injury to make fumigation a veryprofitable procedure against this insect alone, leaving out of consid-eration the effect upon the other pests presen
. Fumigation for the citrus white fly, as adapted to Florida conditions . red scale{CJirysompliulus ficus Ashm.) (fig. 10) is destroyed with a thorough-ness near to absolute extermination by the same dosage which isrequired for the white fly. This has been conclusively proved by theexperimental work conducted by the writer and Mr. W. W. Yothersin January of the present year. Not infrequently in Florida the scaleinsect referred to causes sufficient injury to make fumigation a veryprofitable procedure against this insect alone, leaving out of consid-eration the effect upon the other pests present. The purple scale (Lepidosaphes heckii Newm.) (fig. 11) sometimescalled the brown, oyster-shell, or hard scale, is of greater eco-nomic importance than the Florida red scale on account of its morewide-spread distribution. The results in controlling this pest accom-plished incidentally to work against the white fly are most the same grove where the effect of fumigation on the Florida redscale was observed, the purple scale has been so abundant for years. Fig. 10.—Florida red scale (Chrysomphalus ficus): a, Leavescovered with the male and female scales, natural size; 6, newlyhatched insect with enlargements of antenna and leg; c,d, e,f,different stages in the development of the female insect, drawnto the same scale; g, adult male scale, similarly enlarged.(After Marlatt.) 62 FUMIGATION FOR THE CITRUS WHITE PLY. that the owners fruit-shipping records show annual Losses from thissource amounting to between 15 and 20 cents per tree. Live scalesin all stages, particularly the egg and adult, were very abundantbefore fumigating, but up to the 1st of June careful examinatioithousands of leaves, twigs, and green fruits by Mr. Yothers and thewriter have not led to the finding of a single living specimen of thisspecies in the section of the grove which was the most heavilyinfested. At this season of the year there is usually no difficulty infinding more or less abundant
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